Puh-lese!!
- Do you care what's in the added line? (or would a solution using random content work/be required?)
- How are you defining line?
(A collection of chars followed by a \n? ...and, then how are you defining "\n"?
or maybe...
a string of not_more_than 65|72|80 chars?)
...And oh, yeah, we may need to know encoding, ...
- To what sort of file are you adding this line: text or binary?
- OS?
And WHAT HAVE YOU READ? WHAT HAVE YOU TRIED?
Suggest you read How do I post a question effectively?, perldoc, the FAQs here, and maybe search for "prepend" "filehandle" or....
Enough.
Here's a simple, less sarcastic reply: We don't do other people's homework (not "knowingly" anyway) and we greatly prefer to spend time answering questions where post shows that the poster has made some effort (eg, has written and posted code; has provided a clear and unambiguous indication of the expected/desired results, etc.)
So go ahead and make our day. Demonstrate some effort and you'll find rich rewards here.
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